Genuine Dell YY922 525w Power Supply PSU (No Wiring Harness Included) for Dell Precision T3400, 400sc, 390 And 380, Compatible Model Number: N525E-00, NPS-525AB A Part Numbers: YY922, YN637 Wattage: 525 Watts Max Compatiblity: Precision T3400, 400sc, 390 and 380 DOES NOT INCLUDE WIRING HARNESS